Ventilator



J MARSHALL Aug. 2, 1938.

VENTILATOR Filed Dec. 4, 1936 'ir'raRA/EY Patented Aug. 2, 1938 PATENT OFFICE VENTILATUR John Marshall, Pollokshawa, Glasgow, Scotland Application December 4, 1936,8erial No. 114,123 In Great Brltaln March 17, 1938 4 Claims. (CI. 98-41) This invention relates to ventilators, especially for use inroofs or ceilings.

An object of the invention is to provide a ventilator comprising a flared member, an intermediate apertured bailie member, an outer disc or baiile plate member and means for adjusting said members into predetermined relative positions the flared member, the apertured baiile member and the outer baflle member being adjustable into three relative positions, a fully open position in which said members are spaced apart to form two air passages, an intermediate position in which two of the members assume nested relationship leaving only one passage, and a fully closed posi- 16 tion in which all three members assume nested positions.

In order that the invention may be particularly described and ascertained it will now be described by way of example with reference to the accompanying drawing in which:-

Fig. l is a sectional elevation of a ventilator in accordance with the invention. a

Fig. 2 is a corresponding plan view.

As shown, the ventilator is fixed in an opening i in a roof or ceiling communicating with an air supply duct 2 and comprises an outer flared member 3, an intermediate flared annulus member 4, and a lower disc or plate member 5. The disc 5- also prevents 'direct downward blow of air these members 3, 4 and 5 respectively having annular parts 3a, 4a and 5a of convex shape regarded from below and adapted to engage in nested relationship as hereinafter described. In the position shown in Fig. 1 the flared member 3, the annulus 4 and the disc 5 constitute upper and lower air discharge passages respectively denoted by the numerals 6 and l.

The member 3 is supported in the opening i and has attached thereto a three-armed spider 8 carrying a" central boss 9 in which slidably engages a central spindle l8 supporting at its lower end the disc 5 and an'adjusting handle Ill. The spindle i8 is provided with three vertically spaced annular grooves ii any one of which is engageable by three rounded projections I2 located in the boss 9 which has radial enlargements 9a to accommodate these projections which are inwardly urged by resilient means such as a rubber member I 3, spring or the like,'to retain the spindle 59 in any of three vertically adjusted positions.

The intermediate annulus 4 is supported by three angularly spaced brackets l4 attached thereto and attached to, or formed integrally with, a washer i5 supported on the boss 9 and retained in position by a cap it itself retained in Cil position by a split pin ll passing through the spindle.

In the position shown in Fig. 1, the ventilator is fully open, air being discharged through the upper and lower passages. The flared member 3, 5 the annulus 4 and disc 5 in that order are of decreasing size, but the annulus 4 is of greater size than the opening I while the disc 5 is of greater size than the opening 4b in the annulus 4, so that the annulus and disc act to mum and diiiuse the 10 air discharged through the openings l and 4b.

By raising the spindle It until the middle notch II is engaged by the propections II, the lower passage 1 is closed by the convex part in. of the disc 5 coming into nested relationship with the 15 annulus 4 and closing the opening 417 thereof. Similarly the upper passage 6 can be closed by further raising the spindle l8 until the lowest groove Ii is engaged by the projection i2. Thereupon the convex part 4a of the annulus 4, already 20 engaged by the disc 5, comes into nested relationship with the convex part 341 of the flared member 3 and closes the opening i.

The above description having been given merely by way of example, it follows that modifications 25 may be made without departing from the scope of the invention. For example, guide means may be provided to prevent rotation of the annulus 4 or disc 3. Such means may comprise upward projections on the disc and the annulus adapted slidably to engage a fixed part such as the spider arms or other part connected to the flared member 3.

To prevent noise in closing and/or to provide more eiiective closure, sound-adsorbing and/or packing material may be provided on the arcuate portions in, 4a and 5a of the members 3, 4 and 5.

The ventilator may include or consist mainly of parts made of sheet metal, for example, brass, 40 or may include or consist mainly of parts made of mouldable plastics such as synthetic resinoid substances, vulcanite or the like.

I claim:-

1. A ventilator comprising a fixed flared mem- 45 ber, an intermediate apertured baiiie member, an outer bailie member, means for movabiy connecting said apertured baiiie member and said outer baiiie member to the flared member so as to be relatively movable to each other and to the flared member, and means for holding said members in predetermined relative positions including closed, fully open and at least one intermediate position, the outer member being adapted to engage the apertured member and to move together with 56 estimate.

ilnai part of the closing movement.

2. A'ventilatorcomprising a flied flared member, an intermediate apertured baiile member, an outer baiiie member, flied support means for movably supporting saidapertured member and said outer baiile'inember, a spindle to whichsaid outer baflie member is attached and which is slidable in' said support means, spaced retaining means on the spindle adapted to engage filth said support means and hold said outer bame member in spaced relationship to the intermediate Me and the flxed flared member, and hold said outer baflle member in closed relationship with the intermediate bafie member but spaced from the flxed flared member and hold said outer baiile members and intermediate member in closed re lationship with each other and the flxed flared member, the outer baile member beingzadapted so; to engage the apertured member and tosinove toclosing movement.

gether with same during the final part of the a flared mem- 3. A ventilator comprising ber, an intermediate apex-aired baiile member, an

outer baiiie member, means for supporting said apertured and cuter baiiie members movably wihh reference to the flared member and to each other and means for maintaining said members in three relative positions, a iully open position in which said members are spaced apart to form two air passages, an intermediate position in which two oi the members assume nested relationship and close one of passages, and a fully closed position in which'all three members assume relatienship. g 4. hventilator comprising a fixed flared member, a central support thereon, an intermediate annular baiiie member slidably supported on said support, an outer baiile plate Qznember, a spindle thereon slidably engaging said support, three longitudinally spaced recesses on the spindle and spring-urged projection means in the support for engaging said recesses, each member having ra part is! oonvex shape regarded from the air discharge side and said members being slidah-ly adjustable into three relative positions in which 

